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J Control Release ; 371: 216-236, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38810705

ABSTRACT

Nanoparticles have a great potential to significantly improve the delivery of therapeutics to the brain and may also be equipped with properties to investigate brain function. The brain, being a highly complex organ shielded by selective barriers, requires its own specialized detection system. However, a significant hurdle to achieve these goals is still the identification of individual nanoparticles within the brain with sufficient cellular, subcellular, and temporal resolution. This review aims to provide a comprehensive summary of the current knowledge on detection systems for tracking nanoparticles across the blood-brain barrier and within the brain. We discuss commonly employed in vivo and ex vivo nanoparticle identification and quantification methods, as well as various imaging modalities able to detect nanoparticles in the brain. Advantages and weaknesses of these modalities as well as the biological factors that must be considered when interpreting results obtained through nanotechnologies are summarized. Finally, we critically evaluate the prevailing limitations of existing technologies and explore potential solutions.


Subject(s)
Blood-Brain Barrier , Brain , Drug Carriers , Nanoparticles , Animals , Brain/metabolism , Humans , Blood-Brain Barrier/metabolism , Drug Carriers/chemistry , Nanotechnology/methods
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